Bring depthai_nodes into depthai-core#1415

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thehiddenwaffle:develop_dai-nodes

Commits on Aug 7, 2025

Added support for contrib host nodes as a separate library depending on core(DEPTHAI_BUILD_EXT_HOST_NODES).
thehiddenwaffle
committed

Commits on Aug 15, 2025

Added extended host nodes support to examples and added one for SimCCKeypointParser. Made the parser actually work.
thehiddenwaffle
committed